Best Open-Source Uptime Monitoring Tool for a SaaS App
3 open-source options compared for uptime monitoring tool for a SaaS app, with live GitHub data on each.
Last updated Repo data refreshed 24 Oct 20263 options
Our pick · uptime-kuma
Our pick is Uptime Kuma for most SaaS applications due to its exceptional user-friendliness, comprehensive monitoring features, and integrated status page. This actively developed self-hosted monitoring tool provides external uptime monitoring and notifications right out of the box. For critical internal cron jobs and background tasks, Healthchecks.io, a cron job and background task monitoring service, serves as an ideal complementary tool. Larger SaaS applications requiring highly scalable, deeply integrated, and custom metric-driven monitoring can leverage Prometheus, a monitoring system and time series database, accepting its higher complexity.
Uptime Kuma vs Healthchecks vs Prometheus: side by side
★ 92,812 starsLicence: MITLast commit 24 Oct 2026Latest release 23 Oct 2026JavaScript
An open-source, self-hosted monitoring tool with a beautiful UI, offering various types of checks and instant notifications for your services.
Best for: Small to medium SaaS applications needing an easy-to-deploy, feature-rich uptime monitor with a public status page and diverse notification options.
What's good
Extremely user-friendly interface for setting up monitors and viewing their status.
Supports a wide range of monitoring types including HTTP/S, TCP, Ping, DNS, Docker, and push monitors.
Comprehensive notification options integrated with popular services like Discord, Slack, Telegram, Email, Webhooks, and PagerDuty.
Built-in, customizable status page feature, making it easy to provide public transparency for your SaaS uptime.
Watch out for
Scalability for geographically distributed checks might require multiple instances or external orchestration, not handled natively.
Advanced metrics, deep performance analysis, and long-term historical data granularity are less sophisticated compared to dedicated monitoring stacks like Prometheus.
Primarily focuses on external endpoint availability and simple service health rather than deep application-level metrics.
★ 10,445 starsLicence: BSD-3-ClauseLast commit 22 Oct 2026Latest release 22 Oct 2026Python
A cron job and service monitoring system that listens for periodic 'pings' from your services and alerts you if they don't check in on time.
Best for: SaaS applications needing reliable monitoring for internal cron jobs, background tasks, and daemon health checks, ideally complementing an external uptime monitor.
What's good
Excellent for monitoring background jobs, cron tasks, API calls, and internal service 'heartbeats' that are crucial for a SaaS app.
Simple, clean, and efficient web interface for managing checks and viewing their status, prioritizing clarity.
Supports a variety of notification channels including email, Slack, Discord, PagerDuty, Opsgenie, and custom webhooks.
Very low resource footprint, making it easy and cost-effective to self-host alongside other services.
Watch out for
Does not actively 'ping' external services like a traditional uptime monitor; it relies on your services to initiate the 'ping' (pull-based monitoring).
Not designed for public-facing uptime monitoring or complex HTTP endpoint checks with response body assertions.
While the code is open-source, advanced features like team management are often associated with their commercial hosted offering or require additional self-hosting setup.
★ 66,723 starsLicence: Apache-2.0Last commit 24 Oct 2026Latest release 21 Oct 2026Go
Prometheus is an Apache-2.0 licensed, open-source monitoring system and time-series database. It is often utilized with the Blackbox Exporter for external uptime checks and integrated with Grafana for visualization, forming a comprehensive monitoring stack.
Best for: SaaS applications, particularly large or growing ones, that require highly customizable, scalable, and deep monitoring capabilities beyond simple uptime, encompassing both performance metrics and system health. This tool is best suited for those willing to invest in significant setup and ongoing operational management.
What's good
Extremely powerful and flexible for monitoring a vast array of services, including deep application metrics and system-level health beyond simple uptime checks.
Highly scalable and reliable, making it suitable for large-scale SaaS environments with complex infrastructure.
Provides rich alerting capabilities through Alertmanager, which supports complex rule-based notifications to various channels with de-duplication and grouping.
When combined with Grafana, it offers extensive visualization and dashboarding options for historical data, trend analysis, and custom status pages.
Watch out for
It presents a significantly higher complexity and learning curve to set up, configure, and maintain the entire stack, including Prometheus, Blackbox Exporter, Grafana, and Alertmanager.
Requires understanding of PromQL for effective querying, rule creation, and dashboarding, which can be a steep learning curve for new users.
Not an out-of-the-box, single-tool solution; it necessitates careful integration and management of multiple distinct components to achieve a full monitoring solution.
"Dormant" means no commit pushed to the default branch in the last 12 months. "Archived" means the maintainers have marked the repository read-only on GitHub. "Deprecated" means the project's README says it is deprecated or no longer maintained. Stars, licence, commit and release dates come from the GitHub API (GitLab for projects developed there) and are cached for up to 24 hours. The written analysis is AI-assisted and checked against that data.
Frequently asked questions
Are Uptime Kuma, Healthchecks and Prometheus actively maintained?
Uptime Kuma, Healthchecks and Prometheus are active: each has had a commit in the last 12 months (most recent: Uptime Kuma on 24 Oct 2026, Healthchecks on 22 Oct 2026, Prometheus on 24 Oct 2026). Status is checked against GitHub daily.
What licences do Uptime Kuma, Healthchecks and Prometheus use?
Uptime Kuma: MIT; Healthchecks: BSD-3-Clause; Prometheus: Apache-2.0. Check each project's licence file before use.
Which is easiest to learn: Uptime Kuma, Healthchecks or Prometheus?
By our estimate (1 = easiest, 5 = steepest): Uptime Kuma 2/5, Healthchecks 2/5, Prometheus 4/5. Uptime Kuma and Healthchecks share the gentlest learning curve. This is ExploreGit's AI-assisted estimate, not a measured figure.
